HackingHealthcareHealthcareCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDPHIHealth (basic)MediumContained

College Hospital Costa Mesa

bd_23c3fb6b4bb28a05 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 17, 2024

Filed

Mar 10, 2025

To disclose

25 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

65%

Full breach record for College Hospital Costa Mesa →

College Hospital Costa Mesa notified former employees and patients of a data breach. Unauthorized access occurred between August 14, 2024, and September 17, 2024. The organization discovered the incident on September 17, 2024. Affected data included names, Social Security numbers, driver's license numbers, dates of birth, and health information such as diagnoses and dates of service. The organization engaged forensic experts, notified law enforcement, and offered credit monitoring.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >90d25 weeks discovery → filing

Incident timeline

undetected · 34 days

discovery → filing · 25 weeks / 174 days

Aug 14, 2024

Begins

Sep 17, 2024

Discovered

Mar 10, 2025

Filed

vs. sector median

+13 wks slower

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitelockbit_3bd_e46e068e95bd86c02024-09-26 · +164dCandidate

Name: College Hospital Costa Mesa
norm: college hospital costa mesa
Domain: chcm.us

Name: College Hospital Costa Mesa
norm: college hospital costa mesa
Domain: chcm.us
Industry: Healthcarellm

Discovered: Sep 17, 2024
Breach occurred: Aug 14, 2024 – Sep 17, 2024
Undetected for: 34 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDPHIHealth (basic)
Data elements: Social Security numberDate of birthMedical information
Attack vector: Unknown
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External

During the incident: Took steps to secure our systems
Launched an investigation with the assistance of third-party forensic experts
Notified law enforcement
Offering a one-year complimentary membership to Equifax Complete Premier
Changes made: Implemented additional safeguards and technical security measures to further protect and monitor our systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 25 weeks(174 days from discovery to filing)
Compliance flags: Leak >90d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://oag.ca.gov/ecrime/databreach/reports/sb24-599722
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 10, 2025
Raw hash: bf74bbdf7dddf82b5cc3bb38b8f520a685f0eb1a348dd4acd9194322cfb0b019

Linked disclosures

Ransomware claims (1)

Reporting entityCollege Hospital Costa Mesa

Victim entityCollege Hospital Costa Mesa

Incidentdiscovered Sep 17, 2024

Stated responseTook steps to secure our systems

ComplianceLeak >90d

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov